Alkenol production

ABSTRACT

The yield of alkenols and cycloalkenols is substantially improved by carrying out the reaction of olefins with formaldehyde in the presence of selected catalysts. In accordance with one embodiment, alk-3-en-1-ols are produced in good yields from isobutylene and formaldehyde in the presence of oxides of Group VIB metals.

This application is a division of my copending Serial Number 651,864,filed Jan. 23, 1976, now U.S. Pat. No. 4,039,594, issued Aug. 2, 1977,which in turn was a division of my Ser. No. 484,261, filed June 28,1974, now U.S. Pat. No. 3,960,973, issued June 1, 1976.

This invention relates to an improved process for the production ofalkenols. In accordance with another aspect, this invention relates toan improved process for producing increased yields of alkenols by thereaction of olefins with formaldehyde in the presence of selectedcatalysts. In accordance with another aspect, alkenols are produced fromolefins and formaldehyde in the presence of catalysts comprisingcarbonyls or oxides of Group VIB metals. In accordance with anotheraspect, this invention relates to an improved process for the productionof increased yields of alkenols from formaldehyde and olefins in thepresence of catalysts comprising organic carboxylic acid salts of GroupIB metals. In accordance with a further aspect, this invention relatesto the use of alkali metal or alkaline earth metal bisulfites ascatalysts for improving the yield of alkenols from olefins andformaldehyde. In accordance with another aspect, this invention relatesto the use of compounds of metals of Groups VB, VIIB, and VIII forincreasing the yield of alkenols from olefins and formaldehyde. Inaccordance with a further aspect, this invention relates to the use offluorided alumina as a catalyst for the conversion of olefins andformaldehyde to alkenols.

Accordingly, an object of this invention is to provide an improvedprocess for production of alkenols.

Another object of this invention is to provide novel catalysts forincreasing the yield of alkenols.

A further object of this invention is to provide an economicallyfeasible process for the production of alkenols whereby high yields ofdesired products are obtained.

Other objects and aspects, as well as the several advantages of theinvention, will be apparent to those skilled in the art upon reading thespecification and the appended claims.

In accordance with the invention, it has been found that alkenols areobtained in high yields and high purity by reacting an olefin withformaldehyde in the presence of a catalyst selected from the groupconsisting of (1) carbonyls and oxides of metals chosen from Group VIB,(2) organic carboxylic acid salts of the metals of Group IB, (3) alkalimetal and alkaline earth metal bisulfites, (4) compounds of the metalsof Groups VB, VIIB, and VIII, and (5) fluorided alumina.

In accordance with one specific embodiment, it has been found thatalk-3-en-1-ols are obtained in high yields and high purity by reactingan olefin such as isobutylene with formaldehyde under liquid phaseconditions in the presence of at least one of the above defined selectedcatalysts.

In accordance with a further embodiment of the invention,3-methyl-3-buten-1-ol in high yields and high purity can be obtained byreacting isobutylene with formaldehyde in the presence of one or more ofthe above defined selected catalysts.

Catalysts suitable for use in the instant invention are selected fromone of the following groups:

A. A suitable catalyst can be selected from the carbonyls or the oxidesof metals from Group VIB of the Periodic Table, i.e., chromium,molybdenum, and tungsten. If a metal carbonyl is employed, it ispreferred though not necessary that a trihydrocarbyl phosphine ortrihydrocarbyl phosphite be employed as a catalyst modifier. The amountof said modifier employed is generally from 1 to 6, inclusive, mols ofmodifier per mol of metal carbonyl. If a metal oxide is employed, thecatalyst may be, if desired, dispersed on a known support material suchas silica, pumice, charcoal, kieselguhr, and the like. Specific examplesof suitable catalysts include MoO₂, WO₃, WO₃ on silica, Cr(CO)₆, Mo(CO)₆modified with triphenyl phophine, Mo(CO)₆, and W(CO)₆.

B. Suitable catalysts can also be selected from the organic carboxylicacid salts of the metals of Group IB of the Periodic Table, i.e.,copper, silver, and gold. These organic carboxylic acid salts can berepresented by the general formula (R-CO₂ -)_(n) M wherein R is hydrogenor a hydrocarbyl radical having from 1-19 carbon atoms and wherein n isan integer which is equal to the valence of the metal M in the salt, andwherein M is one of copper, silver, or gold. Specific examples ofsuitable catalysts from this group include silver acetate and cupricacetate.

C. Other suitable catalysts can be selected from the alkali or alkalineearth metal bisulfites. These salts can be represented by the followinggeneral formula, M'(HSO₃)_(z), wherein M' is an alkali or alkaline earthmetal such as sodium or calcium and z represents the valence of saidmetal in the salt. Specific examples of suitable bisulfites includesodium bisulfite and calcium bisulfite.

D. Another group of suitable catalysts consists of compounds of themetals of Groups VB, VIIB, and VIII of the Periodic Table, e.g.,vanadium, manganese, palladium, iron, and rhodium. These compounds canbe represented by the general formula [M"(Z)_(q) ]_(x) wherein M" is oneof the metals from the above named Groups and wherein Z is an anion orneutral ligand which can be a single atom or group of atoms and whereinq is an integer which when multiplied by the negative charge on Z as theanion equals the valence of M" and wherein x is an integer indicatingthat such compounds may be polymeric; however, x will usually be 1 orperhaps 2. Specific examples of suitable catalysts from this groupinclude rhodium trichloride, palladous cyanide, manganese (II)acetylacetonate, vanadium (III) acetylacetonate, vanadylacetylacetonate, dicyclopentadienyl iron (ferrocene), andμ,μ'-dichlorotetranitrosyldiiron, [Fe(NO)₂ Cl]₂.

E. Another group of suitable catalysts are the fluorided aluminascontaining from about 5 to about 30 weight percent fluorine. Thesecatalysts can be prepared by methods well known in the art such astreatment of alumina with anhydrous HF or impregnation of alumina withaqueous HF or ammonium fluoride.

Olefins which are suitable for use in the instant invention are thosehaving at least one allylic hydrogen, i.e., having the basic structure##STR1## and from 3 to 20 carbon atoms per molecule. The olefinic doublebond in said compounds can be a part of a carbocyclic ring. Furthermore,substituents which are essentially inert under the reaction conditionscan also be present in the olefinic reactant. Typical examples of suchsubstituents include --CN, --Cl, --OCH₃, --CO₂ CH₂ CH₃, and the like.However, one skilled in the art would not employ the metal carbonylcatalysts described in "A" above with olefins having a -CN substituentsince such would be expected to consume or inactivate the catalyst. Ofthe olefinic reactants broadly suitable, the presently preferredolefinic compounds are those containing only carbon and hydrogen such asthe alkenes or cycloalkenes. Examples of suitable olefinic reactantsinclude propylene, isobutylene, α-methylstyrene,1-methyl-4-isopropenylcyclohexene, 1-methylcyclohexene, methallylchloride, methyl isopropenyl ether, 5-methyl-5-hexenenitrile, and thelike, and mixtures thereof.

Formaldehyde is employed as the aldehyde reactant in the instantinvention. However, the formaldehyde reactant may be employed in any ofits well-known, commercially available, nonaqueous forms such as thecyclic trimer, 1,3,5-trioxane, or the polymeric form, paraformaldehyde.

In carrying out the invention, the temperature can be broadly from 150°C.-250° C. The time employed for the reaction of the instant inventioncan be from about 3 minutes up to 24 hours and preferably from 15minutes to two hours. The reaction of the instant invention is generallycarried out under autogeneous pressure, but, if desired, pressure froman inert gas such as nitrogen or helium can also be applied up to about1,000 psig of the inert gas. However, no significant advantages areexpected from the use of the inert gas pressure in this invention.

The amount of catalyst, selected from the above-described suitablegroups of catalysts, which is employed in the reaction of this inventionis generally from 0.1 to 10, preferably from 0.2 to 5, percent byweight, based on the weight of the formaldehyde charged to the reactionmixture.

The molar ratio of olefinic reactant to formaldehyde for the reaction ofthe instant invention is broadly from 1/1 up to 20/1, preferably from5/1 up to 13/1. However, if the olefinic reactant is especiallyexpensive, it is within the scope of this invention to employ a molarexcess of the formaldehyde to promote complete conversion of theolefinic reactant. In such instances, up to about 20 mols offormaldehyde per mol of olefinic reactant can be employed.

It is preferred to carry out the reaction of the instant invention inthe presence of an essentially inert added diluent. However, the use ofan added diluent is not necessary to the practice of the instantinvention. It is also within the scope of the instant invention toemploy the reaction product, e.g., an alkenol, as the diluent forfurther reaction of the olefinic reactant and formaldehyde according tothe instant invention. If a diluent is employed, the amount used willgenerally be in the range of from 10 to 1,000 parts by weight of diluentper one part by weight of formaldehyde in the reaction mixture. Examplesof suitable diluents which can be added include benzene, cyclohexane,heptane, chlorobenzene, diphenyl ether, sulfolane, 3-methylsulfolane,and the like, and mixtures thereof.

When employing catalysts which are soluble in the reaction mixture, thefinal reaction mixture can be distilled directly to yield unconsumedreactants which can be recycled to the reaction zone, product(s), andresidue which generally contains the catalyst which can also be recycledto the reaction zone. When employing a catalyst which is insoluble oronly partially soluble in the reaction mixture, the catalyst is usuallyremoved by filtration, then the filtrate distilled to recover unconsumedreactants and product(s).

The alkenols which are the principal products of the reaction accordingto the instant invention have utility in several areas of the chemicalarts. They may be employed as blending agents for motor fuels or assolvents for lacquers, perfumes, and the like. They can be converted tohalides or ethers, or nitrated for the production of diesel fuelignition promoters. They may also be halogenated, oxidized,hydrogenated, dehydrogenated, or dehydrated, the latter operationproducing conjugated diolefins which have important well-known uses inthe art. A small amount of conjugated diolefin may sometimes be found inthe products of the reaction, according to the instant invention.Presumably, a small amount of the alkenol can be dehydrated in situ toprovide the diolefin in the product.

EXAMPLE I (Control Run)

A one-liter stainless steel autoclave equipped with stirring means wascharged with 200 ml (176 g) of benzene, 16 g of 94.4% paraformaldehyde(0.503 mol), and 278 g (4.964 mol) of isobutylene. The mixture was thenheated at 200° C. for one hour while the pressure (autogeneous) rangedfrom 1,150 down to 1,050 psig. The reactor was cooled and vented, andthe contents filtered. The filtrate was fractionally distilled toprovide four fractions which were analyzed by gas-liquid chromatography(GLC) procedures. The analysis revealed a total of 13.18 g (0.153 mol)of 3-methyl-3-buten-1-ol in the four fractions which is a 30% yieldbased on the formaldehyde starting material. A small amount (about 0.4g) of the formate ester of the above alkenol was also detected in thedistilled product. A considerable amount of unreacted formaldehyde wasdetected in the reaction mixture, but it was not measured.

EXAMPLE II (Invention)

A one-liter autoclave was charged with 200 ml (176 g) of benzene, 16 gof 94.4% paraformaldehyde (0.503 mol), 0.5 g fluorided alumina (havingabout 25 weight percent fluorine), and 295 g (5.26 mol) of isobutylene.The reaction mixture was heated at 200° C. for 1 hour while the pressure(autogeneous) ranged from 1,700 down to 1,450 psig. The reactor wascooled, vented, and the contents filtered. The filtrate was fractionallydistilled into three fractions. Analysis of the fractions by GLCindicated that 25.38 g (0.295 mol) of 3-methyl-3-buten-1-ol had beenobtained for a yield of 59% based on the starting formaldehyde. A smallamount (0.85 g) of the formate ester of the alkenol was detected in thedistilled product, and considerable unreacted formaldehyde was noticedin the product mixture but was not measured.

EXAMPLE II (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g)benzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 0.5 g of sodiumbisulfite, and 312 g (5.57 mol) of isobutylene. The mixture was heatedat 200° C. for 1 hour while the pressure (autogeneous) ranged from 1,900down to 1,550 psig. The reactor was cooled, vented, and the contentsfiltered. The filtrate was fractionally distilled into four fractions.Analysis of the fractions by GLC indicated that 27.18 g (0.316 mol) of3-methyl-3-buten-1ol had been obtained for a yield of 63% based on thestarting formaldehyde. GLC analysis also indicated the presence of 0.80g of the formate ester of the alkenol in the distilled product, and someunreacted formaldehyde was also detected in the reaction mixture but thequantity was not measured.

EXAMPLE IV (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 1.0 g of silveracetate, and 320 g (5.714 mol) of isobutylene. The reaction mixture washeated at 200° C. for one hour while the pressure ranged from 2,250 to1,925 psig. The reactor was cooled, vented, and the contents filtered.The filtrate was fractionally distilled into four fractions. Analysis ofthe fractions by GLC showed that 28.80 (0.335 mol) of3-methyl-3-buten-1-ol had been obtained for a yield of 67 percent basedon the starting formaldehyde. GLC analysis also indicated the presenceof 1.09 g of the formate ester of the alkenol in the distilled product.

EXAMPLE V (Control)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 1.0 g of silversulfate, and 315 g (5.625 mol) of isobutylene. The reaction mixture washeated for one hour at 200° C. while the pressure (autogeneous) rangedfrom 2,050 down to 1,750 psig. The reactor was cooled, vented, and thecontents filtered. The filtrate was distilled into three fractions.Although no unreacted formaldehyde was detected, there was no evidencethat 3-methyl-3-buten-1-ol had been produced in a recoverable amount.Also, a considerable amount of water had been formed in the reactionmixture. The product was not analyzed further.

EXAMPLE VI (Control)

Another run employing silver sulfate as catalyst was carried out but ata lower temperature. In this run a one-liter stainless steel autoclavewas charged with 200 ml (176 g) of benzene, 16 g of 94.4%paraformaldehyde (0.503 mol), 1 gram of silver sulfate, and 305 g (5.446mol) of isobutylene. The reaction mixture was heated at 150° C. for 1hour with an autogeneous pressure of 325 psig. The reactor was cooled,vented, and the contents filtered. The filtrate was analyzed by GLCwhich indicated a yield of about 3% of 3-methyl-3-buten-1-ol based onthe starting formaldehyde. A large amount of unreacted formaldehyde wasalso present, but the quantity was not measured.

EXAMPLE VII (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g)benzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 1.0 g of cupricacetate monohydrate, and 385 g (5.446 mol) isobutylene. The reactionmixture was heated at 175°-200° C. for one hour while the pressure(autogeneous) ranged from 1,500-1,250 psig. The reactor was cooled,vented, and the contents filtered. Some metallic copper was removedduring the filtration step. The filtrate was fractionally distilled intofour fractions. Analysis of the fractions by GLC showed that 21.96 g(0.255 mol) of 3-methyl-3-buten-1-ol had been obtained for a yield of51% based on the startinng formaldehyde. GLC analysis also indicatedthat 0.84 g of the formate ester of the alkenol had been produced. Aconsiderable amount of unreacted formaldehyde was detected in theproduct, but the quantity was not measured.

EXAMPLE VIII (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 0.5 g of chromiumhexacarbonyl, Cr(CO)₆, and 325 g (5.804 mol) of isobutylene. Thereaction mixture was heated at 200° C. for 1 hour. The reactor wascooled and vented, and the reaction mixture distilled into fourfractions. GLC analysis of the fractions indicated that 26.16 g (0.304mol) of 3-methyl-3-buten-1-ol had been obtained for a yield of 60% basedon the starting formaldehyde. GLC analysis also indicated the presenceof 1.38 g of the formate ester of the alkenol in the reaction mixture.Considerable unreacted formaldehyde was also noted in the reactionmixture, but the quantity was not measured.

EXAMPLE IX (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 0.5 g of tungstenhexacarbonyl, W(CO)₆, and 275 g (4.911 mol) of isobutylene. The reactionmixture was heated at 200° C. for 1 hour. The reaction mixture wasdistilled into four fractions. GLC analysis of the fraction showed that19.81 g (0.230 mol) of 3-methyl-3-buten-1ol had been obtained for ayield of 46% based on the starting formaldehyde. The formate ester ofthe alkenol was also present (0.88 g) as indicated by GLC analysis.Considerable unreacted formaldehyde was also noted in the reactionmixture, but the quantity was not measured.

EXAMPLE X (Invention)

A one-liter stainless steel autoclave was charged with 250 ml (220 g) ofbenzene, 16 g of 95.4% paraformaldehyde (0.509 mol), 0.5 g molybdenumhexacarbonyl, Mo(CO)₆, and 300 g (5.357 mol) of isobutylene. Thereaction mixture was heated at 200° C. for 1 hour while the pressure(autogeneous) ranged from 2,000 down to 1,350 psig. The reactor wascooled and vented, and the contents distilled into four fractions. GLCanalysis of the fractions showed that 17.99 g (0.209 mol) of3-methyl-3-buten-1-ol had been obtained for a yield of 41% based on thestarting formaldehyde. The GLC analysis also indicated that 0.81 g ofthe formate ester of the alkenol had been obtained.

EXAMPLE XI (Invention)

A one-liter stainless steel autoclave was charged with 250 ml (220 g) ofbenzene, 16 g of 92.8% paraformaldehyde (0.495 mol), 0.5 g molybdenumhexacarbonyl, Mo(CO)₆, and 335 g (5.982 mol) of isobutylene. Thereaction mixture was heated at 200° C. for 2 hours. The reactor wascooled, vented, and the contents filtered. A small amount of thefiltrate was lost due to a spill. The filtrate was distilled into fourfractions. GLC analysis of the fractions showed that 24.11 g (0.280 mol)of 3-methyl-3-buten-1-ol had been obtained for a yield of 57% based onthe starting formaldehyde. The GLC analysis also indicated that 1.21 gof the formate ester of the alkenol had been obtained.

EXAMPLE XII (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 0.5 g (1.9 mmol) ofmolybdenum hexacarbonyl, 0.5 g (1.9 mmol) of triphenylphosphine, and 295g (5.268 mol) of isobutylene. The reaction mixture was heated at 200° C.for 1 hour. The reactor was cooled, vented, and the contents filtered.The filtrate was distilled into four fractions. GLC analysis of thefractions showed that 30.28 g (0.352 mol) of 3-methyl-3-buten-1-ol hadbeen obtained for a yield of 70% based on the starting formaldehyde. GLCanalysis also indicated that 0.97 g of the formate ester of the alkenolhad also been obtained.

EXAMPLE XIII (Invention)

A one-liter autoclave was charged with 250 ml (220 g) of benzene, 31 gof 92.8% paraformaldehyde (0.959 mol), 1 gram of tungsten hexacarbonyl,W(CO)₆, and 280 g (5.00 mol) of 1-butene. The reaction mixture washeated at 225° C. for 6 hours while the pressure (autogeneous) rangedfrom 2,750 down to 2,300 psig. The reactor was cooled and vented anddistilled into four fractions. GLC analysis of the fraction indicatedthat 16.56 g (0.192 mol) of 3-penten-1-ol (cis and trans) had beenobtained for a yield of 20% based on the starting formaldehyde. However,GLC analysis also showed that 6.72 g of the formate ester of thealkenols had been obtained.

EXAMPLE XIV (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 0.5 g of manganese(II) acetylacetonate, and 310 g (5.536 mol) of isobutylene. The reactionmixture was heated at 200° C. for 1 hour while the pressure(autogeneous) ranged from 2,000 down to 1,700 psig. The reactor wascooled, vented, and the contents filtered. The filtrate was distilledinto four fractions. Analysis of the fractions by GLC showed that 24.92g (0.290 mol) of 3-methyl-3-buten-1-ol had been obtained for a yield of58% based on the starting formaldehyde. The analysis also showed that0.88 of the formate ester of the alkenol had been obtained.

EXAMPLE XV (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g)benzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 0.5 g of ferrocene(dicyclopentadienyl iron), and 280 g (5.0 mol) of isobutylene. Thereaction mixture was heated for 1 hour at 200° C. The reactor wascooled, vented, and the contents filtered. The filtrate was distilledinto four fractions. GLC analysis of the fractions showed that 25.00 g(0.291 mol) of 3-methyl-3-buten-1-ol had been obtained for a yield of58% based on the starting formaldehyde. The analysis also indicated that1.0 g of the formate ester of the alkenol had been obtained.

EXAMPLE XVI (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 16 g of 94.4% paraformaldehyde (0.503 mol), 0.2 g of μ,μ'-di-chlorotetranitrosyldiiron, [Fe(NO)₂ C1]₂, and 282 g (5.036 mol) ofisobutylene. The reaction mixture was heated at 200° C. for 1 hour whilethe pressure (autogeneous) ranged from 1,350 down to 1,050 psig. Thereactor was cooled, vented, and the contents filtered. The filtrate wasdistilled into four fractions. GLC analysis of the fractions indicatedthat 21.18 g (0.246 mol) of 3-methyl-3-buten-1-ol had been obtained fora yield of 49% based on the starting formaldehyde. The analysis alsoshowed that 0.97 g of the formate ester of the alkenol had beenobtained.

EXAMPLE XVII (Invention)

A one-liter autoclave was charged with 200 ml (176 g) of benzene, 16 gof 94.4% paraformaldehyde, 0.5 g of rhodium trichloride, RhCl₃, and 291g (5.196 mol) of isobutylene. The reaction mixture was heated at 200° C.for 1 hour while the autogeneous pressure ranged from 1,400 down to1,350 psig. The reactor was cooled, vented, and the contents filtered.The filtrate was distilled into four fractions. GLC analysis of thefractions indicated that 17.53 g (0.204 mol) of 3-methyl-3-buten-1-olhad been obtained for a yield of 40% based on the starting formaldehyde.Analysis showed also that 0.9 g of the formate ester of the abovealkenol had been obtained. A small amount of 3-methyl-2-buten-1-ol wasalso noted in the mixture and was apparently formed by isomerization ofthe former alkenol.

EXAMPLE XVIII (Invention)

A one-liter autoclave was charged with 200 ml (155 g) of acetonitrile,16 g of 94.4% paraformaldehyde (0.503 mol), 0.5 g of palladous cyanide,Pd(CN)₂, and 292 g (5.214 mol) of isobutylene. The reaction mixture washeated at 200° C. for 2 hours while the pressure (autogeneous) rangedfrom 1,750 down to 1,350 psig. The reactor was cooled, vented, and thecontents filtered. The filtrate was distilled into four fractions.Analysis of the fractions by GLC indicated that 19.12 g (0.222 mol) of3-methyl-3-buten-1ol had been obtained for a yield of 44% based on thestarting formaldehyde. Only about 0.1 g of the formate ester of thealkenol was obtained as indicated by the GLC analysis. A considerableamount of unreacted formaldehyde was noted in the reaction mixture, butthe quantity was not measured.

EXAMPLE XIX (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 22 g of 94.4% paraformaldehyde (0.692 mol), 0.5 g of molybdenumdioxide (MoO₂), and 293 g (5.232 mol) of isobutylene. The mixture washeated at 200° C. for 1 hour while the pressure (autogeneous) rangedfrom 1,750 down to 1,300 psig. The reactor was cooled, vented, and thecontents filtered. The filtrate was distilled into four fractions. GLCanalysis of the fractions showed that 33.97 g (0.395 mol) of3-methyl-3-buten-1-ol had been obtained for a yield of 57% based on thestarting formaldehyde. The analysis also showed that 1.45 g of theformate ester of the alkenol was obtained.

EXAMPLE XX (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 16 g of 94.4% paraformaldehyde, 0.5 g of vanadium (III)acetylacetonate [V(AcAc)₃ ], and 300 g (5.357 mol) of isobutylene. Themixture was heated at 200° C. for 1 hour while the pressure(autogeneous) ranged from 1,700 down to 1,600 psig. The reactor wascooled, vented, and the contents filtered. The filtrate was distilledinto four fractions. Analysis of the fractions by GLC showed that 21.62g (0.251 mol) of 3-methyl-3-buten-1-ol had been obtained for a yield of50% based on the starting formaldehyde. The formate ester was alsoobtained in the amount of 1.93 g according to the GLC analysis.Considerable unreacted formaldehyde was noted in the reaction mixture,but the amount was not measured.

EXAMPLE XXI (Invention)

A series of three runs was conducted employing vanadyl acetylacetonate[VO(AcAc)₂ ] as the catalyst for the reaction of formaldehyde withisobutylene. Each of the runs was carried out in the general manner ofExample XX employing 200 ml (176 g) of benzene diluent, 16 g of 94.4%paraformaldehyde (0.503 mol), and 0.5 g of VO(AcAc)₂ as catalyst. Theresults of these runs are shown in Table I below.

                  TABLE I                                                         ______________________________________                                                           Yield                                                      Run  Isobutylene,                                                                              Temp. , Time, Alkenol,                                                                             Formate                                 No.  g (mol)     ° C                                                                            hr.   %.sup.(a)                                                                            Ester, g.sup.(b)                        ______________________________________                                        1    295 (5.268) 150     1     24     1.92                                    2    290 (5.197) 200     1     50     2.80                                    3    295 (5.268) 250     0.5   34     2.49                                    ______________________________________                                         .sup.(a) 3-Methyl-3-buten-1-ol by GLC analysis of distilled product. Yiel     based on starting formaldehyde.                                               .sup.(b) By GLC analysis of distilled product. This material is the           formate ester of the alkenol, 3-methyl-3-buten-1-ol.                     

EXAMPLE XXII (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 22 g of 94.4% paraformaldehyde (0.692 mol), 0.5 g of tungsticoxide (WO₃), and 298 g (5.321 mol) of isobutylene. The mixture washeated at 200° C. for 1 hour while the autogeneous pressure ranged from2,000 down to 1,300 psig. The reactor was cooled, vented, and thecontents filtered. The filtrate was distilled into four fractions. GLCanalysis of the fractions showed that 26.35 g (0.304 mol) of3-methyl-3-buten-1-ol had been obtained for a yield of 44% based on thestarting formaldehyde. The analysis also indicated that 0.64 g of theformate ester of the alkenol had been obtained. Considerable unreactedformaldehyde was noted in the reaction mixture, but the quantity was notmeasured.

EXAMPLE XXIII (Invention)

A series of four runs was carried out which employed a tungsten oxide(WO₃) on silica catalyst for the reaction of formaldehyde withisobutylene according to the instant invention. The composition of thecatalyst was as follows: about 8 weight percent WO₃, 0.1 weight percentAl₂ O₃, 0.1 weight percent Na₂ O, with the balance being silica. Each ofthe runs was carried out in essentially the same manner as that employedin Example XXII. Each run employed 200 ml (176 g) of benzene diluent, 16g of 94.4% paraformaldehyde (0.503 mol), and 0.5 g of the finely groundtungsten oxide on silica catalyst described above. The results fromthese runs are shown below in Table II.

                  TABLE II                                                        ______________________________________                                                           Yield                                                      Run  Isobutylene Temp.,  Time, Alkenol,                                                                             Formate                                 No.  g (mol)     ° C                                                                            hr.   %.sup.(a)                                                                            Ester, g.sup.(b)                        ______________________________________                                        1    245 (4.375) 125     1     20     0.77                                    2    325 (5.804) 175     1     29     0.48                                    3    293 (5.232) 200     1     52     0.94                                    4    280 (5.00)  275     0.33  65     0.48                                    ______________________________________                                         .sup.(a) 3-Methyl-3-buten-1-ol by GLC analysis of distilled product with      yield based on starting formaldehyde.                                         .sup.(b) Formate ester of 3-methyl-3-buten-1-ol by GLC analysis of            distilled product.                                                       

EXAMPLE XXIV (Invention)

A one-liter stainless steel autoclave was charged with 200 ml (176 g) ofbenzene, 31.5 g of a solution of formaldehyde in methanol whichcontained 15.09 g (0.503 mol) of formaldehyde, 0.5 g of the finelyground tungsten oxide (WO₃) on silica catalyst employed in ExampleXXIII, and 305 g (5.446 mol) of isobutylene. The reaction mixture washeated at 200° C. for 1 hour while the pressure ranged from 1,900 downto 1,500 psig. The reactor was cooled, vented, and the contentsfiltered. The filtrate was distilled into four fractions. GLC analysisof the fractions showed that 30.41 g (0.354 mol) of3-methyl-3-buten-1-ol had been obtained for a yield of 70% based on thestarting formaldehyde. Only a trace amount of the formate ester of thealkenol was obtained according to the GLC analysis.

EXAMPLE XXV (Invention)

A one-liter stainless steel autoclave was charged with 31.5 g of asolution of formaldehyde in methanol containing 15.09 g (0.503 mol) offormaldehyde, 0.5 g of the finely ground tungsten oxide on silicacatalyst employed in Examples XXIII and XXIV, and 290 g (5.179 mol) ofisobutylene. The reaction mixture was heated for 1 hour at 200° C. whilethe pressure ranged from 1,400 down to 1,300 psig. The reactor wascooled, vented and the contents filtered with the air of benzene torinse out the reactor. The filtrate was distilled into three fractions.GLC analysis of the fractions showed that 24.21 g (0.282 mol) of3-methyl-3-buten-1-ol had been obtained for a yield of 56% based on thestarting formaldehyde. Only a trace amount of the formate ester of thealkenol had been obtained according to the GLC analysis.

In addition to the above-described invention runs and control runs,other control runs were made which employed materials such as tetrabutylorthotitanate, ammonium nitrate, acid-activated clay (Filtrol 62), andan acidic molecular sieve (SK-500) as catalyst for the reaction offormaldehyde with isobutylene under conditions essentially the same asthose employed in Example I in which no catalyst was employed. The yieldof 3-methyl-3-buten-1-ol in the above runs was essentially the same asthat obtained in said Example I.

Other control runs were carried out using WO₃ on silica or NaHSO₃ ascatalysts with aqueous formaldehyde as the reactant rather then theessentially anhydrous formaldehyde used in the runs of this invention.The above-mentioned runs using aqueous formaldehyde gave inferiorresults in terms of the yield of the desired 3-methyl-3-buten-1-ol andalso rather low yields of the product usually obtained when aqueousformaldehyde is reacted with isobutylene according to the Prinsreaction, i.e., 4,4-dimethyl-1,3-dioxane.

I claim:
 1. A process for the production of alkenols and cycloalkenolswhich comprises reacting:(a) at least one alkene or cycloalkene havingat least one allylic hydrogen having the basic structure ##STR2## andhaving from 3 to 20 carbon atoms per molecule with (b) formmaldehyde inthe presence of (c) a catalyst selected from the group consisting of theoxides of Group VIB metals and optionally a support selected from thegroup consisting of silica, pumice, charcoal, and kieselguhr underreaction conditions including an elevated temperature and pressuresufficient to produce alkenols and cycloalkenols.
 2. A process accordingto claim 1 wherein said reacting is carried out at a temperature in therange of from about 25° C. to about 300° C. and under autogeneouspressure with an amount of catalyst (c) ranging from 0.1 to 10 weightpercent based on the weight of formaldehyde present and a molar ratio of(a) to (b) in the range of from 1:1 to 20:1.
 3. A process according toclaim 1 wherein said reacting is carried out in an inert reactiondiluent.
 4. A process according to claim 1 for the production of3-methyl-3-buten-1-ol which comprises reacting (a) isobutylene with (b)formaldehyde at a temperature in the range of from about 150° C. toabout 250° C. under autogeneous pressure.
 5. A process according toclaim 4 wherein said catalyst is selected from molybdenum dioxide,tungstic oxide, and tungsten oxide on silica.
 6. A process according toclaim 1 wherein (a) is isobutylene and said reacting is carried out inbenzene as a reaction diluent and in the presence of (c) molybdenumdioxide, tungstic oxide, or tungsten oxide on silica.